Betelgeuse

Betelgeuse
Cineál	ollfhathach dearg, réalta athraitheach fhadtréimhseach, réalta threorach, foinse neas-infridhearg agus foinse UV
Cineál speictreach (réalta)	M1-M2Ia-Iab
Réaltbhuíon	an Bodach
Aois	J2000.0
Saintréithe fisiceacha agus réaltmhéadracha
Fad ón Domhan	548 ly
Ga	955 R☉; 887 R☉; 1,000 R☉; 1,172 R☉
Dearbhmhéid	−5.14
Méid dhealraitheach (V)	0.42 (banda V)
Mais	17.8 M☉, 25 M☉, 10 M☉ agus 19 M☉
Teocht éifeachtach	3,654 K
Saobhdhiallas	6.55 mas
Dualghluaisne (diallas)	11.3 mas/y
Dualghluaisne (dronairde)	27.54 mas/y
Luas rothlaithe réaltach	5 km/s
Luas gathach	21.91 km/s
Imtharraingt dromchla	2.7 cm/s²
Dronairde (α)	5h 55m 10.3054s
Diallas (δ)	7° 24′ 25.4304″
Miotalacht	−0.21
Dath	dath B-V= 1.86
Lonrachas	60,000 lonrachas na gréine
Aois measta	10,000,000 bliain
Cuid de	Winter Triangle (en)
Catalóga réalteolaíochta
	SAO 113271 (Smithsonian Astrophysical Observatory Star Catalog (en) ); GSC 00129-01873 (Guide Star Catalog (en) ); 2MASS J05551028+0724255 (2MASS); HD 39801 (catalóg Henry Draper); HIP 27989 (Hipparcos Catalogue (en) ); HR 2061 (Bright Star Catalogue (en) ); IRAS 05524+0723 (IRAS); α Ori (Bayer designation (en) ); 58 Ori (Flamsteed designation (en) ); ADS 4506 AP (Aitken Double Star Catalogue (en) ); BD+07 1055 (Durchmusterung (en) ); CCDM J05552+0724AP (Catalog of Components of Double and Multiple Stars (en) ); FK5 224 (FK5 (en) ); GC 7451 (Boss General Catalogue (en) ); GCRV 3679 (General Catalogue of Stellar Radial Velocities (en) ); HIC 27989 (Hipparcos Input Catalogue (en) ); IRC +10100 (Two-Micron Sky Survey (en) ); JP11 1282 (JP11 (en) ); N30 1266 (Catalog of 5,268 Standard Stars Based on the Normal System N30 (en) ); PLX 1362 (General Catalogue of Trigonometric Stellar Parallaxes (en) ); PLX 1362.00 (General Catalogue of Trigonometric Stellar Parallaxes (en) ); PMC 90-93 162 (Tokyo Photoelectric Meridian Circle Catalog (en) ); PPM 149643 (PPM Star Catalogue (en) ); RAFGL 836 (The Revised AFGL (RAFGL) catalogue (en) ); TD1 5587 (TD1 Catalog of Stellar Ultraviolet Fluxes (en) ); TYC 129-1873-1 (Tycho Catalogue (en) ); UBV 21314 (UBV Photoelectric Photometry Catalogue (en) ); alf Ori (General Catalogue of Variable Stars); WDS J05552+0724A (Washington Double Star Catalog (en) ); WDS J05552+0724Aa,Ab (Washington Double Star Catalog (en) ); WDS J05552+0724Aa,Ac (Washington Double Star Catalog (en) ); YZ 7 2503 (Yale Observatory Zone Catalog (en) ); [LFO93] 0552+07 (CO and HCN observations of circumstellar envelopes. A catalogue - mass loss rates and distributions (en) ); WEB 5485 (Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Radial velocities: The Wilson-Evans-Batten catalogue (en) ); TIC 269273552 (TESS Input Catalog (en) ); AAVSO 0549+07 (AAVSO (en) ); AG+07 681 (AGK3U (en) )

An naoú réalta is gile sa spéir san oíche, agus an dara réalta is gile i réaltbhuíon Oríon (nó an Bhodaigh) is ea Betelgeuse, ar a dtugtar freisin, de réir ainmniú Bayer, Alfa Orionis (α Orionis, α Ori). De ghnáth, ní bhíonn sé níos gile ná a chomharsa Rigel (Beta Orionis). Is réalta athraitheach leathrialta é agus athraíonn a mhéid idir 0.2 agus 1.2. Bíonn dath scothdhearg ar leighligh aige. Marcáileann an réalta an rinn uachtarach ar dheis sa Triantán Geimhridh agus lár an Heicseagáin Gheimhridh.